LangGraph (LangChain)
LangChain and LangGraph are open-source frameworks for LLM apps and stateful agents; LangSmith is the company's paid tracing and deployment platform.
Free tierOpen sourcefrom $39/moVerified
Our verdict
A mature, widely used choice for complex, stateful agents with explicit control flow, plus the best observability story via LangSmith. More concepts to learn than lighter SDKs.
Best for
- ✓ Complex multi-step agents with branching
- ✓ Production tracing and evals
- ✓ Python and TypeScript teams
Watch out for
- ! Steeper learning curve
- ! Observability costs scale with traces
Pricing
Read from the official pricing page. Prices in USD; always confirm on the vendor's site.
| Plan | Price | Details |
|---|---|---|
| Open-source libraries (LangChain, LangGraph) | Free | MIT-licensed libraries; free to use. |
| LangSmith Developer | Free | 1 seat; 5k base traces/mo included, then pay-as-you-go; base traces retained 14 days; 7 LSU/mo Fleet allowance. |
| LangSmith Plus | $39/mo | $39 per seat/month; 10k base traces/mo included, then pay-as-you-go; 1 free Serverless (Small) deployment; additional deployments metered in LSUs (1 LSU = $1), e.g. runtime compute 0.0675 LSU per vCPU-hr. |
| LangSmith Enterprise | Custom | Custom pricing; contact sales. Billing period not stated on page. Check site. |
Note: Paid tiers are for LangSmith (the hosted platform); the libraries themselves are free. Usage-based LSU charges apply on top of seat fees. Enterprise billing period not stated.
Open source (MIT (langchain and langgraph repos)).
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